Insulator.



arma/Mya PATENTED MAY 29, 1906.

F. M. LOCKB. INSULATOR.

-III

APPLICATION FILED JUHEZS, 1902.

w/TNESSES uivrrED sr-ArEsi PATENT orf-FICE; FRED M. LOUKE, OE vieroii, NEW VDRK.

' iNsuLAToRi Specification `of Letters Patent,A

Patented Mayas, 1906. 4

Application'filed Tune 23,1902. Serial No. 112,933.

ducting-wire and the pin, thereby preventing the arcing of the current Vand, burning of the pin.

To that end my.' invention consists in constructing-the center piece of the sulator with a broad skirt tapering upwa dly as it approaches the top portion of the insulator,

thereby forming a center piece which is bell shape, the center being provided with the usual opening for the pin; and to that end my invention further consists in the several new and-novel features of construction, which are hereinafter described, and specifically set forth in the claim hereunto annexed. It is constructed as follows, reference being had to the accompanying drawing, in. which I show a vertical section of the insulator complete. y

a is the top portion constructed in the ordinar f manner havin recesses a which is adapted to receive the upper end of the cenj ter piece b The center piece at its upper end is of any shape desired; but as it approaches the lower end it extends outwardly, as shown, thereby imparting to-'the center piece the bell-shaped appearance, and has the effect of increasing the insulating area upon theface ofthe center piece and at the same time increasing 'the arcing distance between the conducting-wire and the pin, lth'ereby preventing the arcing of the current to this point. I i

c is the center pin, opening in the base of the center piece, and'by flaring the base of the center piece downwardly and outwardly the walls of the :opening c are gradually increased in thickness, and therefore the current is less liable to leak'or arc to the pin which is inserted in the opening c, which arcing or leakage might tend to burn the pin off.

As a further protection against the accu'rnu-.

lation of moisture at the base' of the insulator the top a is made in the form of an inverted cup and is fitted over and upon the upper end of the part b, which enters the recess a.4 This top a, is nearly the same diameter of the part b, and its upper face is con- Vex, soas to deflect any moisture beyond the" thickened base of the center piece where it is joined onto the pin and cross-arm.

vHaving described my invention, what I claim, and desire to secure by Letters Patent,

A bell-shape porcelain center piece gradually increasing in diameter from top to bot'-v hand on this 9th day of June, 1902.

FRED M. LooKE. i

Witnesses:

M. W. BURKE, W. C. DRYER'. 

